However, after the laughing had faded about Keane's comments, a few people started to point out online another reason why the pair might not have got along, and it's down to a quote in Roy Keane's second Autobiography.

Roy said that the United players at the time needed to mix it up in training but Carlos was having none of it. Keane's book tells the rest:

“No, Roy, we need repetition — that’s what we need. Repetition.

“And I said, ‘Carlos, do you always make love to your wife in the same position?’

“And I think he went, ‘What — where is this going.’

“I said, ‘You change the position, don’t you? Sometimes you have to mix training up a little bit. That’s all I’m saying.”

"I haven't a clue why I said that - I still don't," he finished before admitting that sure enough, the boss had to get involved to tell the pair to cop on.

Mentioning a man's sexual activities with his wife was probably a step too far, Roy.